Answer
The width is 10 centimeters
Work Step by Step
We consider the width of the box as $x$ centimeters. Therefore, three times the width is $3x$ cm.
Since the length ($34$ cm) is $4$ centimeters more than three times the width, we write the following equation and solve:
$34-3x=4$
$-3x=4-34$
$-3x=-30$
$x=\frac{-30}{-3}$
$x=10$
Therefore, the width is 10 centimeters.
